Swimming is good but, like others, up to a point.

来源: 7grizzly 于 2023-01-13 10:56:58 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (97 bytes)

There is the cost of adaptation. See https://www.strongfirst.com/the-cost-of-adaptation/

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